Device for transversally cutting a rolled strip

ABSTRACT

The invention relates to a device for transversally cutting a rolled strip using shears, especially drum shears. According to the invention, a gap between the end of the roller table upstream of the shears and the beginning of the roller table downstream of the shears, where there is no support for the rolled strip, is reduced by a pivotable roller table part supporting the rolled strip as it passes through, and a mobile guiding table is arranged between said pivotable roller table part and the beginning of the rear roller table.

The invention concerns a device for cutting rolled strip to length witha shear, especially a rotary shear, in which a gap between the end ofthe roller table upstream of the shear and the beginning of the rollertable downstream of the shear, where the rolled strip is unsupported, isreduced by a swiveling roller table part that supports the rolled stripas it passes through.

Shears for cutting rolled strip to length in a hot rolling wide stripmill, in a cold-rolling tandem mill, and in hot rolling and cold rollingmills are well known. The use of crank shears and rotary shears ispreferred for this purpose. Designs of rotary shears are described, forexample, in DE 199 53 906 A1 and in DE 100 01 928 A1.

DE 12 70 368 describes a crank shear for rolled steel in which aconveying roller table has a gap in the area of the cutter circle. Arotating conveying segment that has approximately the width of thecutter and is provided with an approximately semicircularly curved outersurface closes the gap in the conveying roller table when the segment isin its upper position.

A disadvantage of the known designs of a device of this type for cuttingrolled strip to length is that, although the distance of the supportpoints/support lines of the rolled strip upstream and downstream of theshear is reduced by a conveying segment that can be rotated in, therolled strip experiences a deviation from the rolling or conveyingdirection, depending on the thickness, the surface tension, etc. Due tothe greater distances between the support points or lines, the stripflow is disturbed in the device for cutting rolled strip to length. Theleading end of the strip reacts very sensitively to these greaterdistances. The rolled strip can become oriented towards the top or thebottom in this area and can become jammed, e.g., between the conveyingsegment and the roller table. The equipment has to be shut down. Thethinner the rolled strip is, the greater the danger that this willoccur.

Therefore, the objective of the invention is to create a device forcutting rolled strip to length which avoids the aforesaid disadvantages.

In accordance with the invention, this objective is achieved byarranging a movable guide table between a swiveling roller table partand the beginning of the downstream roller table. This movable guidetable reduces the distance without support points/support lines for therolled strip in such a way that deviation of the rolled strip is notpossible.

It is advantageous if an additional, movable guide table that isinterlocked with the swiveling roller table part is arranged between theend of the upstream roller table and the swiveling roller table. The gapin the roller table is then completely closed.

In an advantageous refinement of the invention, the upper drum and thelower drum have flattened surfaces on their outer periphery. Thiscreates a larger opening for the passage of the rolled strip, and duringthe threading of the rolled strip, the drums, especially the upper drum,do not present obstacles on which the rolled strip is stopped.

It is also advantageous for a movable deflector to be arranged in frontof the upper drum. This provides an entry funnel for the rolled strip,thereby preventing upward deviation of the rolled strip.

Additional refinements of the device of the invention are specified inthe dependent claims.

A specific embodiment of the invention is described in greater detailbelow with reference to the highly schematic drawings.

FIG. 1 shows a device for cutting rolled strip to length in the positionin which the beginning of the strip is threaded in.

FIG. 2 shows a device according to FIG. 1 in the cutting position.

FIG. 1 shows a device 1 for cutting rolled strip 2 to length with afront roller table 3 and a rear roller table 4. The rolled strip 2 iscut by an upper cutter 5, which is mounted on an upper drum 6, and alower cutter 7, which is mounted on a lower drum 8. The drums 6, 8rotate in opposite directions about an upper axis of rotation 9 and alower axis of rotation 10. The direction of rotation is indicated byarrows 11, 12.

A movable deflector 13 is located above the front roller table 3. Astationary or movable deflector 14 is located above the rear rollertable 4.

The drums 6, 8 are rotated in such a way during the threading of thestrip that the flattened surfaces 15, 15′, 16, 16′, especially theflattened surface 15 on the upper drum 6, are oriented, together withthe movable deflector 13, so as to form an entry funnel.

To ensure that the rolled strip 2, which is supported on the frontroller table 3, arrives safely on the rear roller table 4, a swivelingroller table part 17 is rotated into a gap. In this rotation, theswiveling roller table part 17 moves around the lower drum 8. To closethe gap completely, movable guide tables 18, 19 are arranged between theswiveling roller table part 17 and the front roller table 3 and betweenthe swiveling roller table part 17 and the rear roller table 4. To closethe gap completely, the swiveling roller table part 17 and the movableguide table 18, 19 are interlocked.

FIG. 2 shows the rolled strip 2 and the drums 6, 8 with the cutters 5,7. The cutters 5, 7 are now positioned in a cutting position. To thisend, the upper drum 6 with the upper cutter 5 and the lower drum 8 withthe lower cutter 7 are rotated in opposite directions about the upperaxis of rotation 9 and the lower axis of rotation 10, respectively. Toaccomplish this, the swiveling roller table part 17 was rotated out ofthe gap in the roller table.

To prevent damage to the swiveling roller table 17 by, for example,falling residual pieces of the rolled strip 2, the swiveling rollertable part 17 is rotated in such a way that it is covered by the lowerdrum 8.

In addition, the movable guide tables 18, 19 can avoid the circular arcthrough which the lower cutter 8 moves. This is accomplished, forexample, by a linear lateral movement or a rotational movement.

LIST OF REFERENCE NUMBERS

-   1 cut-to-length device-   2 rolled strip-   3 front roller table-   4 rear roller table-   5 upper cutter-   6 upper drum-   7 lower cutter-   8 lower drum-   9 upper axis of rotation-   10 lower axis of rotation-   11 direction of rotation of the upper drum-   12 direction of rotation of the lower drum-   13 movable deflector-   14 stationary deflector-   15, 15′ flattened surface of the upper drum-   16, 16′ flattened surface of the lower drum-   17 movable roller table part-   18 movable guide table-   19 movable guide table

1. Device for cutting rolled strip to length with a shear, especially arotary shear, in which a gap between the end of the roller tableupstream of the shear and the beginning of the roller table downstreamof the shear, where the rolled strip is unsupported, is reduced by aswiveling roller table part that supports the rolled strip as it passesthrough, wherein a movable guide table (18) is arranged between aswiveling roller table part (17) and the beginning of the rear rollertable (4).
 2. Device in accordance with claim 1, wherein a movable guidetable (19) is arranged between the end of the front roller table (3) andthe swiveling roller table part (17).
 3. Device in accordance with claim1, wherein the outer surface of the swiveling roller table part (17) isengaged with the outer surface of the movable guide table (18, 19). 4.Device in accordance with claim 1, wherein the upper drum (6) and thelower drum (8) have flattened surfaces (15, 15′, 16, 16′) on their outerperiphery.
 5. Device in accordance with claim 1, wherein a movabledeflector (13) is arranged upstream of the upper drum (6).
 6. Device inaccordance with claim 1, wherein a stationary or movable deflector (14)is arranged downstream of the upper drum (6).